The Merrimack County Courthouse stands at 163 North Main Street in Concord, New Hampshire, the state capital and county seat of Merrimack County. The oldest part of the courthouse building is a brick and granite two story structure, completed in 1857 to serve as a town hall and court building. The city and county used the building for town offices and county courts until 1904, when the city sold its interest in the building to the county. Between 1905 and 1907 the building was extensively remodeled to plans by local architect George S. Forrest. A modern addition has been made to the rear of the building.The courthouse was listed on the National Register of Historic Places in 1979.
